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Linear Beamforming and Superposition Coding with Common Information for the Gaussian MIMO Broadcast Channel
KTH, Skolan för elektro- och systemteknik (EES), Kommunikationsteori.
Korea Advanced Institute of Science and Technology (KAIST), School of EECS.
2009 (Engelska)Ingår i: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 57, nr 8, s. 2484-2494Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A Gaussian multiple-input multiple-output broadcast channel (MIMO GBC) is considered. Throughout the paper it is assumed that 1) input signals are Gaussian and 2) perfect channel state information is available at the transmitter and at the receivers. By considering each data stream as a single user, the uplink-downlink signal-to-interference-plus-noise (SINR) duality is generalized to the MIMO case with general cross-talk matrix. The duality is subsequently applied to finding the solution for the SINR-balancing problem. The result serves as a tool for characterizing achievable rate regions of different coding strategies. Next, we investigate a superposition coding scheme proposed by Cover-van der Meulen-Hajek and Pursley (nicknamed CMHP [1]), where there is a common message to both users. We consider a MIMO broadcast channel with two users, each user has two antennas and the transmitter has four antennas. Assuming one common stream is sent by CMHP coding and successive decoding, a lower bound to the CMHP rate region is found. Behaviors of the CMHP rate region and sumrate are analyzed. We find the sumrate gaps between DPC, CMHP, and MMSE at high SNR for general 2-user multiple-input single-output (MISO) Gaussian broadcast channel. The result suggests when CMHP is beneficial for sumrate.

Ort, förlag, år, upplaga, sidor
IEEE, 2009. Vol. 57, nr 8, s. 2484-2494
Nyckelord [en]
Broadcast channel, downlink, SINR-balancing, superposition coding, uplink-downlink duality
Nationell ämneskategori
Telekommunikation
Identifikatorer
URN: urn:nbn:se:kth:diva-32178DOI: 10.1109/TCOMM.2009.08.070419ISI: 000268852500043Scopus ID: 2-s2.0-69549133697OAI: oai:DiVA.org:kth-32178DiVA, id: diva2:409705
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QC 20110411

Tillgänglig från: 2011-04-11 Skapad: 2011-04-08 Senast uppdaterad: 2017-12-11Bibliografiskt granskad

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